In order to prevent and control the spontaneous combustion of the coal left in the goaf of the fully-mechanized top coal caving mining face in a shallow depth seam,a systematic study was conducted on the seam occurrence and mining technology condition,coal quality characteristics,coal spontaneous combustion characteristics and spontaneous combustion symbol gas and index optimization of the L type fully-mechanized top coal caving mining face in Lutian Mine.In order to control the coal spontaneous combustion in the goaf,an air curtain set in the top comer of the coal mining face,sandbags wall,rational distributed ventilation volume and other preliminary prevention measures were implemented early or late in the coal mining face,the ventilation method of the coal mining face was changed from the exhaust type negative pressure to the forced positive pressure and the backfill and rolling,the plastic film sealing and other special prevention and control measures were conducted in the surface ground subsidence area.The results showed that after the backfill and rolling,the plastic film sealing and other special prevention and control measures conducted on the surface ground subsidence area,the carbon monoxide concentration in the goaf of the mine was reduced from 39× 10-6 below to 7.5× 10-6,the oxygen concentration in the goaf of the mine was reduced from 17.8％ to 5％ and thus a safety production of the L type fully-mechanized top coal caving mining face in a spontaneous combustion thick seam with a shallow depth could be realized.%为防治浅埋深综放工作面采空区遗留煤炭自燃,对路天煤矿L型综放工作面的煤层赋存与开采技术条件、煤质特征、煤的自燃特性和自燃标志性气体与指标优选进行了系统研究.为治理采空区自然发火,先后实施了在工作面隅角挂挡风帘、垒沙袋墙、合理配备风量等初步防治措施和改变工作面通风方式由抽出式负压为压入式正压,以及在地面沉陷区实施填埋碾压、铺塑料薄膜封闭的专项防治措施.结果表明,采用地面填埋碾压和铺塑料薄膜封闭的专项防治措施后,采空区CO体积分数由39×10-6降低到了7.5×10-6以下,02体积分数由17.8％降低到了5％以下,实现了浅埋深自燃厚煤层L型综放工作面的安全生产.
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